buffer_check_err(9)

💅 buffer_check_err(9) — like, the buffer error checker bestie 💅

okay so this is a page from the Kernel API Manual, and it's about buffer_check_err, a lil helper function that checks buffer errors for you. she's small, she's focused, she does one (1) job and she does it. we stan a lowkey queen 🎀

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✨ NAME ✨

buffer_check_err — helper function to check buffer errors 🦋

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🌸 SYNOPSIS 🌸

int buffer_check_err (int reqOutputBufferLength , unsigned int fixed_len
, struct smb2_query_info_rsp *rsp );

like, that's the whole signature. no cap. 💖

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🫶 ARGUMENTS 🫶

• reqOutputBufferLength — the max buffer length expected in the command response. this is the ceiling, the limit, the "don't come for me unless the buffer is this big" number ✨
• fixed_len — the minimum fixed response length. the floor, bestie. the absolute least you can get away with 💅
• rsp — the query info response buffer, and it contains the output buffer length ⭐

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👑 RETURN 👑

0 on success, otherwise error. that's it. that's the whole vibe check 🌈

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🔥 SEE ALSO 🔥

kernel file ./fs/smb/server/smb2pdu.c — and honestly? the whole friend group showed up. every single one of these:

• smb2_get_ksmbd_tcon(9)
• smb2_set_err_rsp(9)
• is_smb2_neg_cmd(9)
• is_smb2_rsp(9)
• get_smb2_cmd_val(9)
• set_smb2_rsp_status(9)
• init_smb2_neg_rsp(9)
• smb2_set_rsp_credits(9)
• init_chained_smb2_rsp(9)
• is_chained_smb2_message(9)
• init_smb2_rsp_hdr(9)
• smb2_allocate_rsp_buf(9)
• smb2_check_user_session(9)
• smb2_get_name(9)
• smb2_get_dos_mode(9)
• build_rdma_ctx(9)
• smb3_encryption_negotiated(9)
• decode_rdma_ctx(9)
• smb2_handle_negotiate(9)
• smb2_tree_connect(9)
• smb2_create_open_flags(9)
• smb2_tree_disconnect(9)
• smb2_session_logoff(9)
• create_smb2_pipe(9)
• smb2_set_ea(9)
• smb2_open(9)
• smb2_populate_readdir_entry(9)
• smb2_get_ea(9)
• smb2_query_info(9)
• smb2_close_pipe(9)
• smb2_close(9)
• smb2_echo(9)
• smb2_set_info_file(9)
• smb2_set_info(9)
• smb2_read_pipe(9)
• smb2_set_rdma_key(9)
• smb2_prep_rdma_read(9)
• smb2_current_req_len(9)
• check_rdma_desc(9)
• smb2_parse_rdma_write_transform(9)
• smb2_read_rdma(9)
• smb2_read(9)
• smb2_write_pipe(9)
• smb2_write_rdma(9)
• smb2_write(9)
• smb2_flush(9)
• smb2_cancel(9)
• smb2_lock(9)
• smb2_ioctl(9)
• smb20_oplock_break_ack(9)
• smb21_lease_break_ack(9)
• smb2_oplock_break(9)
• smb2_notify(9)
• smb2_is_sign_req(9)
• smb2_check_sign_req(9)
• smb2_get_sign_rsp_iov(9)
• smb2_set_sign_rsp(9)
• smb3_check_sign_req(9)
• smb3_set_sign_rsp(9)
• smb3_preauth_hash_rsp(9)

like I said. the entire group chat. 😭💀

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ngl bestie, if you're here you're probably deep in the ./fs/smb/server trenches and honestly that's main character energy. read the whole list. iykyk 🔥

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okay that's the page!! mwah 🫶 this one shipped out of ./fs/smb/server back in October 2026 — so like, from the future, iconic behavior, she said "I'll be there before you know it" 💜🧚‍♀️✨